org.zalando.stups.tokens.util.Objects.java Source code

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Here is the source code for org.zalando.stups.tokens.util.Objects.java

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/**
 * Copyright (C) 2015 Zalando SE (http://tech.zalando.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.zalando.stups.tokens.util;

import java.util.Collection;

import org.apache.http.util.Args;

/**
 * Basic Utilities. We know there are a lot of libs out there. <br />
 * We just delegate to one in classpath here not to spread around the
 * dependency.
 * 
 * @author jbellmann
 *
 */
public class Objects {

    private Objects() {
        // hide
    }

    public static <T> T notNull(String name, T object) {
        return Args.notNull(object, name);
    }

    public static <T extends CharSequence> T notBlank(String name, T argument) {
        return Args.notBlank(argument, name);
    }

    public static <T extends Object> Collection<T> noNullEntries(String name, Collection<T> collection) {
        name = notBlank("name", name);
        collection = notNull(name, collection);
        try {
            if (collection.contains(null)) {
                throw new IllegalArgumentException(name + " should not contain 'null'");
            }
        } catch (NullPointerException e) {
            return collection;
        }
        return collection;
    }

}